Go patch committed: fix error message quoting

[Ian Lance Taylor]

This patch to the Go frontend fixes the quoting in an error message.
Bootstrapped and ran Go testsuite on x86_64-pc-linux-gnu.  Committed
to mainline.

Ian

Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE     (revision 236804)
+++ gcc/go/gofrontend/MERGE     (working copy)
@@ -1,4 +1,4 @@
-a87af72757d9a2e4479062a459a41d4540398005
+054ff1ece3dd5888a445efeaf3ae197b16d4186f
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: gcc/go/gofrontend/expressions.cc
===================================================================
--- gcc/go/gofrontend/expressions.cc    (revision 236804)
+++ gcc/go/gofrontend/expressions.cc    (working copy)
@@ -11463,7 +11463,7 @@ Selector_expression::lower_method_expres
 
   if (method != NULL && !is_pointer && !method->is_value_method())
     {
-      error_at(location, "method requires pointer (use %<(*%s).%s)%>",
+      error_at(location, "method requires pointer (use %<(*%s).%s%>)",
               nt->message_name().c_str(),
               Gogo::message_name(name).c_str());
       return Expression::make_error(location);